L4903

L4903 DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS . . . . . . . . . . . . PRELIMINARY DATA OUTPUT CURRENTS : I01 = 50mA I02 = 100mA FIXED PRECISION OUTPUT VOLTAGE 5V ± 2 % RESET FUNCTION CONTROLLED BY INPUT VOLTAGE AND OUTPUT 1 VOLTAGE RESET FUNCTION EXTERNALLY PROGRAMMABLE TIMING RESET OUTPUT LEVEL RELATED TO OUTPUT 2 OUTPUT 2 INTERNALLY SWITCHED WITH ACTIVE DISCHARGING OUTPUT 2 DISABLE LOGICAL INPUT LOW LEAKAGE CURRENT, LESS THAN 1µA AT OUTPUT 1 INPUT OVERVOLTAGE PROTECTION UP TO 60V RESET OUTPUT NORMALLY LOW OUTPUT TRANSISTORS SOA PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION Minidip ORDERING NUMBERS : L4903 DESCRIPTION The L4903 is a monolithic low drop dual 5 V regulator designed mainly for supplying microprocessor systems. Reset, data save functions and remote switch on/off control can be realized. PIN CONNECTION July1993 1/8 L4903 PIN FUNCTIONS N° 1 2 3 4 5 6 Name Input 1 Input 2 Timing Capacitor GND Disable Input Reset Output Function Low Quiescent Current 50mA Regulator Input 100mA Regulator Input. If Reg. 2 is switched-ON the delay capacitor is charged with a 10µA constant current. When Reg. 2 is switched-OFF the delay capacitor is discharged. Common Ground A high level (> VDT) disables output Reg. 2. When pin 3 reaches 5V the reset output is switched low. 5V ) ; tRD (ms) = Ct (nF). Therefore tRD = C t ( 10µA 5V – 100mA Regulator Output. Enabled if Vo 1 > VRT. DISABLE INPUT < VDT and VIN 2 > VIT. If Reg. 2 is switched-OFF the C02 capacitor ...